小学英语语法总结：过去完成时1 、过去完成时是一个相对时态，表示过去的过去，只有在两个过去发生的动作相比较时才可显示出来。e.g. As soon as we got to the station, the train had left.注：主从句表达的动作紧接时，即两动作发生的时间没有明显时间上的悬殊或空档时，主从句都可用一般过去时。e.g. Where did your brother study before he joined the army?2 、过去完成时可表示截止过去某一时间动作的总或动作的结束。e.g. By the end of last month. We had reviewed four booksBy eight oclock, he had finished his homework.与这个时态连用的时间状语常有：by 1985, by eight oclock, by then, by the end of last month, by the time when, when, as soon as, before 等连词引导的时间状语从句，表示主句动作结束的时间。
